Dropped connections with pg_basebackup

Have an existing setup of 9.3 servers. Replication has been rock solid,
but recently the circuits between data centers were upgraded and
pg_basebackup now seems to fail often when setting up streaming
replication. What used to take 10+ hours now only took 68 minutes, but
had to do many retries. Many attempts fail within minutes while others
go to 90% or higher and then drop. The reason we are doing a sync is
because we have to swap data centers every so often for compliance. So I
had to swap master and slave.

Calling pg_basebackup like this:
pg_basebackup -P -R -X s -h <HostName> -D <Folder> -U replicator

The error we keep having is:
Sep 23 13:36:32 <HostName> postgres[16804]: [11-1] 2015-09-23 13:36:32
EDT <IP> [unknown] replicator LOG: SSL error: bad write retry
Sep 23 13:36:32 <HostName> postgres[16804]: [12-1] 2015-09-23 13:36:32
EDT <IP> [unknown] replicator LOG: SSL error: bad write retry
Sep 23 13:36:32 <HostName> postgres[16804]: [13-1] 2015-09-23 13:36:32
EDT <IP> [unknown] replicator FATAL: connection to client lost
Sep 23 13:36:32 <HostName> postgres[16972]: [9-1] 2015-09-23 13:36:32
EDT <IP> [unknown] replicator LOG: could not receive data from client:
Connection reset by peer

I have been working with the network team and we have even been actively
monitoring the line, and running ping, as the replication is setup. At
the point the connection reset by peer error happens, we don't see any
issue with the network and ping doesn't show an issue at that point in time.

The issue also happened on another set of machines and likewise, had to
retry many times before pg_basebackup would do the initial sync. Once
the initial sync is set, replication is fine.

I tried both "-X s" (stream) and "-X f" (fetch) and both fail often.

Any ideas what may be going on?